---
description: TypeScript and React engineering and coding standards
globs: *
alwaysApply: true
---

- No explanatory comments.
- Use `for...of` loops for side effects / no-return operations; `.map()` strictly for transformations.
- Extract standalone hooks (`use*.ts`) when hook logic is reused >2 times.
- Component body cap <= 150 lines, Function <= 60 lines, File <= 400 lines.
- Zero `any`, schema-first validation (Zod), explicit `import type`.
- No TypeScript `enum` or `namespace` (use `object-as-const` and ES modules).